钛合金精密铸造用BaZrO_3基复合型壳的制备  

Preparation of BaZrO_3-Based Mould Shell for Titanium Alloy

作　　者：朱文琪[1] 贺进[1] 卫尔蒂妮 汪宏斌[1,2] 李重河 

机构地区：[1]上海大学材料科学与工程学院 [2]上海特种铸造工程技术研究中心 [3]上海市现代冶金与材料制备重点实验室

出　　处：《特种铸造及有色合金》2014年第10期1081-1084,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51225401;51374142);上海市科委基金资助项目(11520500100;11DZ2283400);钢铁冶金新技术国家重点实验室开放课题资助项目(KF12-05)

摘　　要：研究了BaZrO3作为钛合金熔模铸造面层材料的可行性。以自主合成的BaZrO3作为型壳面层的主要耐火材料,钇溶胶作为粘结剂,制备出了BaZrO3基复合型壳。探讨了BaZrO3涂料的粘度和悬浮率随粉液比、级配变化而变化的规律。通过分析经不同温度、时间焙烧后型壳的抗弯强度和断口形貌,最终确定了复合型壳的焙烧工艺。研究表明,当粉液比为3.0、细粉含量为50%～60%（质量分数）时涂料具有最好的粘度和悬浮性。焙烧温度为1 500℃、保温4h时,复合型壳具有最好的抗弯强度。将BaZrO3基复合型壳用于TiNi合金熔模精密铸造时,发现型壳与TiNi合金熔体润湿性差,二者间反应层很薄,说明BaZrO3是较为理想的钛合金精铸的面层材料。The feasibility of barium zirconate （BaZrO3） using as the mould material for investment casting titanium alloy was evaluated. The face coating of BaZrO3-based mould shell was prepared with home- made BaZrO3 particles used as refractory and yttrium sol used as binder. Effects of S/L ratio and grain gradation on properties of slurry including the viscosity, the suspension behavior were investigated. The baking process was finally determined through analyzing bending strength and the fracture morphology of mould shell after baking at different temperatures and hours. The results show that desirable proper- ties including viscosity and suspension behavior of slurry can be realized with S/L ratio of 3.0 and the content of fine powder of 50 % --60 %. The mould shell has appropriate bending strength after baking for 4 hours at 1 500 ℃. The investment casting experiment of TiNi alloy was carried out in BaZrO3-based mould shell. The poor wettability and thin reaction layer between the mould shell and metal melt indi- cates that BaZrO3 is a desirable material for investment casting titanium alloy.

关 键 词：熔模铸造 锆酸钡 钛合金 界面相容性 

分 类 号：TG22[金属学及工艺—铸造] TG292